<!-- eslint-disable vue/return-in-computed-property -->
<!--  -->
<template>
  <section class="msite">
    <!--首页头部-->
    <HeaderTop :title="address.name">
      <span class="header_search" slot="left">
        <i class="iconfont icon-sousuo"></i>
      </span>
      <span class="header_login" slot="right">
        <span class="header_login_text">登录|注册</span>
      </span>
    </HeaderTop>
    <div class="header_content">
      <!--首页导航-->
      <nav class="msite_nav">
        <div class="swiper-container">
          <div class="swiper-wrapper">
            <div
              class="swiper-slide"
              v-for="(categorys, index) in categorysArr"
              :key="index"
            >
              <a
                href="javascript:"
                class="link_to_food"
                v-for="(category, index) in categorys"
                :key="index"
              >
                <div class="food_container">
                  <img :src="baseImageUrl + category.image_url" />
                </div>
                <span>{{ category.title }}</span>
              </a>
            </div>
          </div>
          <!-- Add Pagination -->
          <div class="swiper-pagination"></div>
        </div>
      </nav>
      <!--首页附近商家-->
      <div class="msite_shop_list">
        <div class="shop_header">
          <i class="iconfont icon-xuanxiang"></i>
          <span class="shop_header_title">附近商家</span>
        </div>
        <ShopList />
      </div>
    </div>
  </section>
</template>

<script>
import Swiper from "swiper";
import "swiper/dist/css/swiper.min.css";

import HeaderTop from "@/components/HeaderTop/HeaderTop.vue";
import ShopList from "@/components/ShopList/ShopList.vue";

import { mapState } from "vuex";
export default {
  data() {
    return {
      baseImageUrl: "https://fuss10.elemecdn.com",
    };
  },
  mounted() {
    this.$store.dispatch("getCategorys");
  },
  computed: {
    ...mapState(["address", "categorys"]),
    // 计算属性将一维数组转化成二维数组
    // eslint-disable-next-line vue/return-in-computed-property
    categorysArr() {
      let { categorys } = this;
      return this.arrToTwoDim(categorys);
    },
  },
  components: {
    HeaderTop,
    ShopList,
  },
  methods: {
    // 该方法用来将一个一维数组转化成二维数组
    arrToTwoDim(arr, n = 8) {
      // 准备一个空的二维数组
      let result = [];
      for (let i = 0, j = 0; i < arr.length; i += n) {
        result[j] = [];
        for (let k = 0; k < n; k++) {
          result[j].push(arr[i + k]);
        }
        j++;
      }
      return result;
    },
  },
  watch: {
    categorys(value) {
      this.$nextTick(() => {
        // 创建一个Swiper实例对象，来实现轮播
        new Swiper(".swiper-container", {
          loop: true, //可以循环轮播
          // 如果需要分页器
          pagination: {
            el: ".swiper-pagination",
            clickable: true,
          },
          autoplay: {
            delay: 2000,
            // 如果设置为false，用户操作swiper之后自动切换不会停止，每次都会重新启动autoplay。
            // 操作包括触碰(touch)，拖动，点击pagination等。
            disableOnInteraction: true,
          },
        });
      });
    },
  },
};
</script>
<style lang="stylus" rel="stylesheet/stylus">
@import '../../common/stylus/mixins.styl';

.msite { // 首页
  width: 100%;

  .header_content {
    height: calc(100vh - 45px);
    overflow-y: scroll;

    .msite_nav {
      bottom-border-1px(#e4e4e4);
      margin-top: 45px;
      height: 200px;
      background: #fff;

      .swiper-container {
        width: 100%;
        height: 100%;

        .swiper-wrapper {
          width: 100%;
          height: 100%;

          .swiper-slide {
            display: flex;
            justify-content: center;
            align-items: flex-start;
            flex-wrap: wrap;

            .link_to_food {
              width: 25%;

              .food_container {
                display: block;
                width: 100%;
                text-align: center;
                padding-bottom: 10px;
                font-size: 0;

                img {
                  display: inline-block;
                  width: 50px;
                  height: 50px;
                }
              }

              span {
                display: block;
                width: 100%;
                text-align: center;
                font-size: 13px;
                color: #666;
              }
            }
          }
        }

        .swiper-pagination {
          >span.swiper-pagination-bullet-active {
            background: #ff2d4a;
          }
        }
      }
    }

    .msite_shop_list {
      // top-border-1px(#e4e4e4);
      // margin-top: 10px;
      background: #fff;

      .shop_header {
        padding: 10px 10px 0;

        .shop_icon {
          margin-left: 5px;
          color: #999;
        }

        .shop_header_title {
          color: #999;
          font-size: 14px;
          line-height: 20px;
        }
      }
    }
  }
}
</style>